Basic Trope: A culprit (usually beneath suspicion) confesses to a crime under investigation, but does so sarcastically, and thus is not taken seriously.
- Straight:Hank: But how did the killer exit the room without leaving a blood trail?
James: Simple. He washed his hands in the flower vase.
Hank: And how do you know so much about the killer's m.o., genius?
James: I murdered her myself. She always talked too much, you know.
Hank: Very funny.
James turns out to be the killer in the end, for exactly the reason he stated.
- Exaggerated:Hank: But how did the killer exit the room without leaving a blood trail?
James: Simple. He washed his hands in the flower vase.
Hank: How do you know that? What, are you the killer or something?
James: Oh, yes, Hank. I'm an unrepentant serial killer with 20 years of killing experience. This very night I broke into the study through a hidden passage behind the ancestral portrait, strangled Isabella with my bare hands, and to implicate her fiancee in the murder, I bought a machete two states away with a credit card registered in his name and had his fingerprints planted on it. And as soon as you leave this room, I plan to put that very same machete between your shoulder blades. I know I sound sarcastic right now, but honestly I'm telling you the truth.
Hank: ...Stop being sarcastic, would you? We have work to do. And put that machete down...
- Downplayed:James: We ought to be careful Hank. The killer could be anyone, even you or me.
Hank: One of us, that's ridiculous.
- James is an alien doppelganger infiltrating earth. When he claims to have killed Alice, Hank laughs, knowing that she is alive and well. Little does he realize that the real Alice is dead and is being impersonated.
Hank: James! It was you all along! But... when we were investigating...
- James is trying to prove a point about Hank's poor reasoning.
James: You thought I was being sarcastic, didn't you, Hank? Because you never listen to me, you never take me seriously, and you are so incredibly self-absorbed that you wouldn't even notice if I confessed to the murder right in your face!Hank: Wait a minute, why would you joke about being the murderer if that was exactly the case all along?
James: Because you're funny when you're gullible.
- Hank sarcastically accuses James of being the killer to gauge his reaction. (Or perhaps because he suspects him, and wants him to think he isn't suspected.)Hank: How do you know this, James? Are you the killer?
James: What? You... you seriously think it was me?
Hank: I was being sarcastic, James.
James: An innocent woman is dead, Hank. Fine time for sarcasm.
- James makes a spot-on accusation disguised behind sarcasm. (Though it may be an Accidental Truth.)Hank: She lived such an isolated life. Who would have the drive to kill her?
James: Her fiancé, of course. I was annoyed with her even before she died, can't imagine what it's like having to put up with a brat like her on a daily basis.
The killer is revealed at the very end to be the victim's fiancé, who was forced into marriage and did not get along with her.
- James jokingly fingers himself as the culprit, which due to his lack of alibi and evidence that resembles what he is capable of, is taken as a confession.(During an interrogation)
Hank: This has got nothing to do with you, huh? Then why would the killer go for a victim on the same street as your ex?
James: (Exasperated) For all you know, I could've done it. Might have tried to shoot 'er and hit some schlub in the crossfire by mistake.
Hank: Say that again in court and see what happens.
(James is found guilty at his trial not long after, with this convo used as evidence. Cut to a shot of the real killer in their home, resting comfortably while reading an article about James' sentence.)
- Hank jokingly asks James "if you know so much about it, James, why don't you tell me how you did it already?", and James starts freaking out and trying to prove his innocence. This leads Hank to become suspicious of him.
- Hank sarcastically accuses James of being the killer to gauge his reaction. (Or perhaps because he suspects him, and wants him to think he isn't suspected.)
- Subverted:James: Of course, Hank. I'm the killer.
Hank: Wh-what? It... was you, James?
James: Just joking, old friend. Now let's find the scoundrel who did this.
- Double Subverted:Hank: James! You're the killer? But... when you made the confession, you said that you were being sarcastic!
James: The confession was honesty, Hank. Sarcasm was when I called you my friend.
- Parodied: James is arrested and convicted of his crimes. At the trial, Hank is on the witness stand recalling the bloodstains, the unaccountable disappearances, and "that oddly detailed description of the murder he reported in a sarcastic tone of voice". James mutters "My one mistake."
- Zig Zagged: James confesses sarcastically to Hank that he was the killer. Hank later uncovers evidence and realizes to his horror that James really was the killer. He shoots James dead. And then the real killer appears. Hank struggles with the killer and eventually kills him. And then Hank finds James' body missing, with a note from James thanking him for eliminating his accomplice, and thus the only witness to the murder.
- Averted: Neither James nor Hank confesses or accuses the other.
- Enforced: "Well, we've established James as such a Magnificent Bastard that if we just reveal that he is the killer, it'll look like an Ass Pull. What about that Red Herring in the dialogue?"
- Lampshaded:James: Of course, Hank. I'm the killer.
Hank: I can never tell if you're being honest or sarcastic, James!
James: I know.
- Invoked: James has been blackmailed into working with the killer, and his sarcastic confession is a desperate attempt to steer Hank towards the truth without alerting the killer to his defection.
- Exploited: Hank is suspicious of James and accuses him, expecting a sarcastic confession. Hank arrests James on the spot after the confession.''
- Defied: "And how do you know all that? Are you the killer or something, James? ...James? James, you're bleeding!"
- Discussed: "Case closed. Lesson learned? If your friend sarcastically gives you an accurate description of the murder, maybe you should at least consider him to be a suspect."
- Conversed:Hank: I can't piece this together, James. Give me something to work with.
James: Any suggestions?
Hank: Pretend you're secretly the murderer and you're sarcastically giving me information to throw off my suspicions.
James: Sounds fun.
- Deconstructed: James suffers from numerous psychoses, including a strong compulsion to be perfectly honest. Making confessions in a heavily sarcastic tone is the only way he can keep himself from having a breakdown. Years of this explains his haughty, condescending personality. As he explains to Hank, no completely sane man would explain the details of his greatest crimes, even sarcastically, for fear of being taken seriously.
- Reconstructed: James likes sarcastically confessing to his crimes, as it allows him to feel superior to the idiots he spends all his time with.
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